Polymarket Faces First South Korea Criminal Investigation of Users, Not Operators

Published by James Harris on June 5, 2026June 5, 2026

South Korea has opened what appears to be the country’s first criminal investigation targeting domestic users of Polymarket, deploying cyber units to trace transaction records and identify individuals who traded on the platform ahead of the June 3 national election. No charges have been filed yet, but the investigation itself is the event: it signals that prosecutors are willing to pursue users, not just operators.

The legal question here is genuinely unsettled. As legal experts note, no South Korean court has ruled directly on blockchain-based prediction markets, which means prosecutors are building a case without established precedent to lean on. South Korea bans nearly all gambling outside a narrow set of state-sanctioned activities, but whether event contract trading falls inside that definition is the exact question this case will force into the open. The Korea Communications Standards Commission is running a parallel inquiry that could result in ISP-level blocking, a step already taken against Polymarket in France, Germany, India, and several other jurisdictions. The pattern across those countries is consistent: regulators defaulted to gambling classifications when prediction market operators declined to seek licenses, and enforcement followed.

Crypto settlement is the specific feature that keeps attracting regulatory attention. It removes the conventional payment rails that jurisdictions typically use as a chokepoint.

The timing matters because Polymarket’s growth has moved it out of the niche it occupied two years ago. Bernstein estimates $51 billion in crypto prediction market trading volume for 2025, with projected annual growth rates near 80%. At that scale, the “information market” framing that platforms have used to distinguish themselves from gambling operators becomes harder to sustain in front of a regulator, particularly when the underlying settlement mechanism is designed to be jurisdiction-agnostic. The South Korean case is unlikely to resolve the classification debate on its own, but a ruling that treats user participation as criminal conduct would create pressure on other markets in the region to follow. The securities-versus-gambling binary is not academic: one path leads to licensing and disclosure requirements, the other to outright bans.

How South Korean prosecutors ultimately charge this, and whether courts accept or reject a gambling classification for on-chain event contracts, will produce the first piece of directly applicable case law in a jurisdiction that has historically moved quickly to codify crypto-related rulings into broader regulatory frameworks.